Merge branch 'remove-double-or-empty-titles' into 'stable-3.1'

interface/web/admin/form/users.tform.php

interface/web/admin/templates/directive_snippets_edit.htm

interface/web/admin/templates/firewall_edit.htm

interface/web/admin/templates/remote_action_osupdate.htm

interface/web/admin/templates/remote_user_edit.htm

interface/web/admin/templates/server_edit_services.htm

interface/web/admin/templates/server_ip_edit.htm

interface/web/admin/templates/server_ip_map_edit.htm

interface/web/admin/templates/server_php_fastcgi_edit.htm

interface/web/admin/templates/server_php_fpm_edit.htm

interface/web/admin/templates/server_php_name_edit.htm

interface/web/admin/templates/software_repo_edit.htm

interface/web/admin/templates/system_config_mail_edit.htm

interface/web/admin/templates/system_config_misc_edit.htm

interface/web/admin/templates/system_config_sites_edit.htm

interface/web/admin/templates/users_groups_edit.htm

interface/web/admin/templates/users_user_edit.htm

interface/web/client/lib/lang/ar_client_message.lng

interface/web/client/lib/lang/bg_client_message.lng

interface/web/client/lib/lang/el_client_message.lng